2 * Copyright 1998 Juniper Networks, Inc.
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
7 * Portions of this software was developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 * products derived from this software without specific prior written
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
46 #include <login_cap.h>
63 #define PAM_SM_ACCOUNT
64 #define PAM_SM_PASSWORD
66 #include <security/pam_appl.h>
67 #include <security/pam_modules.h>
68 #include <security/pam_mod_misc.h>
70 #define PASSWORD_HASH "md5"
71 #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
74 #define LOCKED_PREFIX "*LOCKED*"
75 #define LOCKED_PREFIX_LEN (sizeof(LOCKED_PREFIX) - 1)
77 static void makesalt(char []);
79 static char password_hash[] = PASSWORD_HASH;
81 #define PAM_OPT_LOCAL_PASS "local_pass"
82 #define PAM_OPT_NIS_PASS "nis_pass"
85 * authentication management
88 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
89 int argc __unused, const char *argv[] __unused)
94 const char *pass, *user, *realpw, *prompt;
96 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
99 retval = pam_get_user(pamh, &user, NULL);
100 if (retval != PAM_SUCCESS)
103 pwd = getpwnam(user);
105 PAM_LOG("Got user: %s", user);
108 PAM_LOG("Doing real authentication");
109 realpw = pwd->pw_passwd;
110 if (realpw[0] == '\0') {
111 if (!(flags & PAM_DISALLOW_NULL_AUTHTOK) &&
112 openpam_get_option(pamh, PAM_OPT_NULLOK))
113 return (PAM_SUCCESS);
116 lc = login_getpwclass(pwd);
118 PAM_LOG("Doing dummy authentication");
120 lc = login_getclass(NULL);
122 prompt = login_getcapstr(lc, "passwd_prompt", NULL, NULL);
123 retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
125 if (retval != PAM_SUCCESS)
127 PAM_LOG("Got password");
128 if (strcmp(crypt(pass, realpw), realpw) == 0)
129 return (PAM_SUCCESS);
131 PAM_VERBOSE_ERROR("UNIX authentication refused");
132 return (PAM_AUTH_ERR);
136 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
137 int argc __unused, const char *argv[] __unused)
140 return (PAM_SUCCESS);
147 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
148 int argc __unused, const char *argv[] __unused)
150 struct addrinfo hints, *res;
157 const void *rhost, *tty;
158 char rhostip[MAXHOSTNAMELEN] = "";
160 retval = pam_get_user(pamh, &user, NULL);
161 if (retval != PAM_SUCCESS)
164 if (user == NULL || (pwd = getpwnam(user)) == NULL)
165 return (PAM_SERVICE_ERR);
167 PAM_LOG("Got user: %s", user);
169 retval = pam_get_item(pamh, PAM_RHOST, &rhost);
170 if (retval != PAM_SUCCESS)
173 retval = pam_get_item(pamh, PAM_TTY, &tty);
174 if (retval != PAM_SUCCESS)
177 if (*pwd->pw_passwd == '\0' &&
178 (flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
179 return (PAM_NEW_AUTHTOK_REQD);
181 if (strncmp(pwd->pw_passwd, LOCKED_PREFIX, LOCKED_PREFIX_LEN) == 0)
182 return (PAM_AUTH_ERR);
184 lc = login_getpwclass(pwd);
186 PAM_LOG("Unable to get login class for user %s", user);
187 return (PAM_SERVICE_ERR);
190 PAM_LOG("Got login_cap");
192 if (pwd->pw_change || pwd->pw_expire)
193 gettimeofday(&tp, NULL);
196 * Check pw_expire before pw_change - no point in letting the
197 * user change the password on an expired account.
200 if (pwd->pw_expire) {
201 warntime = login_getcaptime(lc, "warnexpire",
202 DEFAULT_WARN, DEFAULT_WARN);
203 if (tp.tv_sec >= pwd->pw_expire) {
205 return (PAM_ACCT_EXPIRED);
206 } else if (pwd->pw_expire - tp.tv_sec < warntime &&
207 (flags & PAM_SILENT) == 0) {
208 pam_error(pamh, "Warning: your account expires on %s",
209 ctime(&pwd->pw_expire));
213 retval = PAM_SUCCESS;
214 if (pwd->pw_change) {
215 warntime = login_getcaptime(lc, "warnpassword",
216 DEFAULT_WARN, DEFAULT_WARN);
217 if (tp.tv_sec >= pwd->pw_change) {
218 retval = PAM_NEW_AUTHTOK_REQD;
219 } else if (pwd->pw_change - tp.tv_sec < warntime &&
220 (flags & PAM_SILENT) == 0) {
221 pam_error(pamh, "Warning: your password expires on %s",
222 ctime(&pwd->pw_change));
227 * From here on, we must leave retval untouched (unless we
228 * know we're going to fail), because we need to remember
229 * whether we're supposed to return PAM_SUCCESS or
230 * PAM_NEW_AUTHTOK_REQD.
233 if (rhost && *(const char *)rhost != '\0') {
234 memset(&hints, 0, sizeof(hints));
235 hints.ai_family = AF_UNSPEC;
236 if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
237 getnameinfo(res->ai_addr, res->ai_addrlen,
238 rhostip, sizeof(rhostip), NULL, 0,
246 * Check host / tty / time-of-day restrictions
249 if (!auth_hostok(lc, rhost, rhostip) ||
250 !auth_ttyok(lc, tty) ||
251 !auth_timeok(lc, time(NULL)))
252 retval = PAM_AUTH_ERR;
260 * password management
262 * standard Unix and NIS password changing
265 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
266 int argc __unused, const char *argv[] __unused)
269 struct ypclnt *ypclnt;
270 const void *yp_domain, *yp_server;
272 char salt[SALTSIZE + 1];
274 struct passwd *pwd, *old_pwd;
275 const char *user, *old_pass, *new_pass;
278 int pfd, tfd, retval;
280 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF))
281 pwd = getpwnam(getlogin());
283 retval = pam_get_user(pamh, &user, NULL);
284 if (retval != PAM_SUCCESS)
286 pwd = getpwnam(user);
290 return (PAM_AUTHTOK_RECOVERY_ERR);
292 PAM_LOG("Got user: %s", user);
294 if (flags & PAM_PRELIM_CHECK) {
296 PAM_LOG("PRELIM round");
299 (pwd->pw_fields & _PWF_SOURCE) == _PWF_FILES)
300 /* root doesn't need the old password */
301 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
304 (pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
306 yp_domain = yp_server = NULL;
307 (void)pam_get_data(pamh, "yp_domain", &yp_domain);
308 (void)pam_get_data(pamh, "yp_server", &yp_server);
310 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_server);
312 return (PAM_BUF_ERR);
314 if (ypclnt_connect(ypclnt) == -1) {
316 return (PAM_SERVICE_ERR);
319 retval = ypclnt_havepasswdd(ypclnt);
322 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
323 else if (retval == -1)
324 return (PAM_SERVICE_ERR);
327 if (pwd->pw_passwd[0] == '\0'
328 && openpam_get_option(pamh, PAM_OPT_NULLOK)) {
330 * No password case. XXX Are we giving too much away
331 * by not prompting for a password?
332 * XXX check PAM_DISALLOW_NULL_AUTHTOK
336 retval = pam_get_authtok(pamh,
337 PAM_OLDAUTHTOK, &old_pass, NULL);
338 if (retval != PAM_SUCCESS)
341 PAM_LOG("Got old password");
342 /* always encrypt first */
343 encrypted = crypt(old_pass, pwd->pw_passwd);
344 if (old_pass[0] == '\0' &&
345 !openpam_get_option(pamh, PAM_OPT_NULLOK))
346 return (PAM_PERM_DENIED);
347 if (strcmp(encrypted, pwd->pw_passwd) != 0)
348 return (PAM_PERM_DENIED);
350 else if (flags & PAM_UPDATE_AUTHTOK) {
351 PAM_LOG("UPDATE round");
353 retval = pam_get_authtok(pamh,
354 PAM_OLDAUTHTOK, &old_pass, NULL);
355 if (retval != PAM_SUCCESS)
357 PAM_LOG("Got old password");
359 /* get new password */
361 retval = pam_get_authtok(pamh,
362 PAM_AUTHTOK, &new_pass, NULL);
363 if (retval != PAM_TRY_AGAIN)
365 pam_error(pamh, "Mismatch; try again, EOF to quit.");
367 PAM_LOG("Got new password");
368 if (retval != PAM_SUCCESS) {
369 PAM_VERBOSE_ERROR("Unable to get new password");
373 if (getuid() != 0 && new_pass[0] == '\0' &&
374 !openpam_get_option(pamh, PAM_OPT_NULLOK))
375 return (PAM_PERM_DENIED);
377 if ((old_pwd = pw_dup(pwd)) == NULL)
378 return (PAM_BUF_ERR);
380 lc = login_getclass(pwd->pw_class);
381 if (login_setcryptfmt(lc, password_hash, NULL) == NULL)
382 openpam_log(PAM_LOG_ERROR,
383 "can't set password cipher, relying on default");
385 /* set password expiry date */
387 passwordtime = login_getcaptime(lc, "passwordtime", 0, 0);
388 if (passwordtime > 0)
389 pwd->pw_change = time(NULL) + passwordtime;
393 pwd->pw_passwd = crypt(new_pass, salt);
395 switch (old_pwd->pw_fields & _PWF_SOURCE) {
398 retval = PAM_SERVICE_ERR;
399 if (pw_init(NULL, NULL))
400 openpam_log(PAM_LOG_ERROR, "pw_init() failed");
401 else if ((pfd = pw_lock()) == -1)
402 openpam_log(PAM_LOG_ERROR, "pw_lock() failed");
403 else if ((tfd = pw_tmp(-1)) == -1)
404 openpam_log(PAM_LOG_ERROR, "pw_tmp() failed");
405 else if (pw_copy(pfd, tfd, pwd, old_pwd) == -1)
406 openpam_log(PAM_LOG_ERROR, "pw_copy() failed");
407 else if (pw_mkdb(pwd->pw_name) == -1)
408 openpam_log(PAM_LOG_ERROR, "pw_mkdb() failed");
410 retval = PAM_SUCCESS;
415 yp_domain = yp_server = NULL;
416 (void)pam_get_data(pamh, "yp_domain", &yp_domain);
417 (void)pam_get_data(pamh, "yp_server", &yp_server);
418 ypclnt = ypclnt_new(yp_domain,
419 "passwd.byname", yp_server);
420 if (ypclnt == NULL) {
421 retval = PAM_BUF_ERR;
422 } else if (ypclnt_connect(ypclnt) == -1 ||
423 ypclnt_passwd(ypclnt, pwd, old_pass) == -1) {
424 openpam_log(PAM_LOG_ERROR, "%s", ypclnt->error);
425 retval = PAM_SERVICE_ERR;
427 retval = PAM_SUCCESS;
432 openpam_log(PAM_LOG_ERROR, "unsupported source 0x%x",
433 pwd->pw_fields & _PWF_SOURCE);
434 retval = PAM_SERVICE_ERR;
442 PAM_LOG("Illegal 'flags'");
448 /* Mostly stolen from passwd(1)'s local_passwd.c - markm */
450 static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
451 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
454 to64(char *s, long v, int n)
457 *s++ = itoa64[v&0x3f];
462 /* Salt suitable for traditional DES and MD5 */
464 makesalt(char salt[SALTSIZE + 1])
468 /* These are not really random numbers, they are just
469 * numbers that change to thwart construction of a
472 for (i = 0; i < SALTSIZE; i += 4)
473 to64(&salt[i], arc4random(), 4);
474 salt[SALTSIZE] = '\0';
477 PAM_MODULE_ENTRY("pam_unix");